<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body {
            border-style: dotted;
            border-color: gray;
        }
        .square {
            border: dotted 1px blue;
            width: 400px;
            height: 100px;
            margin: 10px;
        }
    </style>
</head>
<body>
<div class="square"></div>
</body>
</html>